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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3596a1a34aca5cf78f3ca27dce6fa1fd175b706c9e0ff02f001d52b9b7b1507d' 
  AND token = 'lr/d4TbFLv+tXa6L4Xz31wnW/qNIoOKbDd5rkHkhERw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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