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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74ca950a27bd9dd7fe12cb8fcdcebc00b9e3c6a99dd3a16f9ea2da9409957264' 
  AND token = 'JIXmW6lc0napKMlNmRC6KZDmwnJP2h5D+UGz9VJQyBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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