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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae72f67bbf60ae795df9840fc5a8ed8bc34c2546f14179ff43cc6b4fcc69ca7d' 
  AND token = 'IBQ4VbpTMDlrV4NsWLFr8rqy/hZnE34IsIMdpNHy2wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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