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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e0308cbf0f7ed48a99e48fda4fbf441825f72020c518619177cb4fffb37d30a' 
  AND token = '+dHMUbIDO33l7trjnUYCfUGjeSY4SPUpfAC9murqUB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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