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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96823c8117956629a96a77b3ec6f197c7c02d7cb5f621e8e5340e7ccaccbabbd' 
  AND token = 'YzWO7YxXvYKK2ZOHekO47/KzxBYpeJPhxHizW8UQ3aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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