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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abceccc7756eab50f6fd1234db1fb9ffaafc232c2da03d5c7fdbe3242cf54b44' 
  AND token = 'nrBy31Zbzq8UqKX1LwKhfikyM505eNO+OEDl4NghetQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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