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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38d71432d0d695e754cef83da71704c652fef747529e0b4db42dd5f3d03c5b21' 
  AND token = 'X2hidgqhGe6rd6ZDjQtdKWUnAJVcfWiemttrtfHjzkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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