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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cd5697e5d8b08c95363bea0820bc64f14f2584a3448e425106e942870cf4828' 
  AND token = 'FTi12TwUKTmd+4W836us1+i9S4xY003p5sB10vVTNhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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