SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a106c711dbf4854e521f3bb6d4b8524dee30957b3c5d007fb36f05ca85232d6' 
  AND token = 'DOF516uqtfXm6zWB/A2h/kRqLgLC8Pw7kb4rBQ9p3FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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