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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b64be7d00cde722551f2a5bdba660a8734d31fe40c0fac05969d08bc2db0c6d' 
  AND token = '0CJH7vJl/kb47SdhJmHTrjiIGWpQSO60C8W6U8kzeTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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