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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dce2777ccd8649ec04a475e4ab743ab8cd17224b5569316aca215c1cd30df02d' 
  AND token = 'j626n8pb4UnpV0qooIFbJ65LaqDKY25vafzyz9fGCr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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