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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fa947e53af59911cc75c9b6e2ff61f07b82213433f417469f186f2947b1c516' 
  AND token = 'Mp7xRixXKt3uAjekHzh9YIfwusrkCcSxmyBA7uRTUnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}