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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d18aae35af94152cad8f57b586372175a635326a79d5eb4e9f500078cdcb04e' 
  AND token = 'a6F8RUk39tu1gEeWwwyM/bQRIBC4rzBMDoDcT4tUChg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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