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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d324bcd718d9adcde8c51871b915532fa00010ede80fa92573fb582c757b09d' 
  AND token = '7RGcTJofFDuQdJErtcWjyDHBOTxdgNPNRh/Q9gY9G1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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