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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9543bebbbeb4b3fad3a4f917f5116e559ef5378cda8c482ff0a6ebea947a2f69' 
  AND token = 'dUhwr+x0z+maouJ7x1sYscTcyEEd9YJWi0yUAc9yUQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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