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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85cba06d18f545df1c21086afa3eebc87303370ea4e41197576d9fae3941848a' 
  AND token = 'QLiYfNpes8BSf6rBzqjfEP/QRHuPGxV0X4dO6/X4bxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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