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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c750fe38a743a2d5971eae349dabf6703b22cb530b6cc956e296b8376ae4f37a' 
  AND token = 'll4JcU8GF0LjhvpG0hxmebGPeYr4LBaNyf3iGqxis/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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