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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e1672c36cee6e6dd23ebe515a58bd3aed2b4a416cfe5b305c7540eede1b3b6d' 
  AND token = 'T7aMPiBm29PyFzZm8Trs/VQ3I13OOG9wVb1WAu9iKFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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