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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52c521cbcca40c6b0234bd7a122ce7859a66c139981389987312db2d07dbc6b8' 
  AND token = '5l5A9y61uFq7opHiLQ7x/H/xkUecRq8v+QAQq+zfcbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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