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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3eb61513ed90dc3e4e1d43e7b8afe7f96d1cff3c41c4ef41c4924c9c96a5baba' 
  AND token = '0PhPY3i3yAtD9t5LE0ThobPFSkLkHub8zwU/c79M2aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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