Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18cdd6525c631e6c5621bf076d64458312e6c7bc8ee8efa7c563337711a27b81' 
  AND token = '0kLDLaiux7zzL1L2MsBGHhywcAddmS5Rm+5aLkrO1mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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