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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d8dca67b32bd3799940491c46bd5d790915f618b63a39f3af4e3018b0bcc810' 
  AND token = 'QikcYj9mwA4ZHCXj6KSN8S54lFzRfFJSb1HvRnxAfw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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