SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98c419e0d1e16fd602e086365efd68cfed92ee71420494f47f4085d9f01358c3' 
  AND token = 'taMvYwYu+NgTDUn+MmT1xWJuuh5yB3yGTnJTRYZf9xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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