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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '540f3cced1e702003fe62d952543871193d8a069ce7e688f83c0291f8158c22f' 
  AND token = '//3awBTuroFqxZu/F2PIKqZq7zq7fco7ufBuIQAINcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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