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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddb08ba1728ab2b95bbb5364a415110bd8ac2acb2a19718066a07a435411e36c' 
  AND token = '0Bs5S0cQA2SqjAzxBRa1TbTPTZzN4IgGmmFb5WYpyU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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