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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '723e350f88dfa4fbbba0bb5c9421fc0fcf0aeb209aea6c893fd0cfd2cc991427' 
  AND token = '1p9YEDeEqjvaFa7fZBhqH8FE9rXz6gtTtzc3qH/2Sao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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