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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a614fb16c3b2efd1aefc5d053454d33249d19da626f6ae854285a91e0b69ea1c' 
  AND token = 'XrpBFsBASFFt2mwrVIlrwpB7Ai1qWR23rnankoTJAfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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