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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8cb9ab79ec5b810029d3e1415349fb42f477990ef1ac8ff5374210389b01c7d' 
  AND token = 'eEIb1moI0qHuZGcuzYtZvYvHyi9aa7gM+I8a3OQaqJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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