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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb47e0139c0e160c41f5ccd73b5ee74ad48043d995410f7848969906526b9b25' 
  AND token = 'q7dN9ncAzl1gpzSBRSuplBsTPjMRpNieU8oXr/sLs/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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