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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a47b4d9b8e61b08a9b20868a57fa46e2f4c7aeb0a4c26b437ee36cc9a3e07eef' 
  AND token = 'N1e7ZgMS1NICo0k582cT6gCTxWNjRHn6YTmqBN3ej1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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