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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7534c2d8bff49c6b256b2a8de306b8a63a2721c0cbd0e28ed2b6b63e661428de' 
  AND token = '4CET0rMjexiVraNTa6CPP3B3//PfDEs3Z9uRW3Jz0us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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