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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6683298210205361154bc9d6ea679994a82fa4a171c930d0d4bc068066c07c0f' 
  AND token = 'bfQiLQIPh4bbUfouz+M3Fgb9l4uag188DsuJ9IyKG9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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