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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '136512f0ef40cac861aa1eb418bcd913ca6eceea04d6c10eeec1a4df14b40b37' 
  AND token = 'Hik2DwZQMWG8FPQmK798zwvslLppgimewoe43Ri5bns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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