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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb2744cf7f6e25a67487c2193cb5fa86ac34b6ca4c6d1d2048aae8956a79ad8d' 
  AND token = 'fhXu2D4fyTrqfiuTOfcmGv4HavEmlQMIlfO5Ii3iaBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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