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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f20ec81c46d2f6d8bf8aa90c81eb1febc0063f61f427dba589ed73b880912420' 
  AND token = 'qxSQ+EMNHD0toqVxPui2Wq35A2NrrJ5W5fRXnK4jB+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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