SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3214b8130d9f3c1d3fb55a3f04d8136ba8c69397275a98640d4fd70f13f77595' 
  AND token = '+n4vfCU3CDO5+YKZtE1uPwrxWeW1HBQ1Fw7qigwqZcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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