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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daf1eaefabf35211b73262a517be0a7eb8b1b9ac31f618af9370cc7216f6a898' 
  AND token = 'HTO3fBCv5oXwr4SbSHxMWRq+NEfU14LoWZ9vG4n5xDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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