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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5239d35c06044cb64760701c2afaa84c07936e552bc282c504662347c431e5d6' 
  AND token = '6HEw8mOt716c/t0q70l6WcteNSIsU/QMKAaUNDyDKOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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