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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd38ef6f8cb184ccf755c89cc186a156e08213f7606daf4b83d2adfce138e78df' 
  AND token = 'u6iZxJtSvSyX+8IkrGMj9v2EiKLoZjyG4GY9Rk3rMEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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