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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfeb2db12f6e046fb7276bc9f7de688da1e5b81ee12da74a2072768a9da6f78e' 
  AND token = 'yTCkHyLBIv6MQh36v6u4wzBSnFIrZqXxbjT80UxHMcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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