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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01cd5afed27681f83f98dc989454f84d74eebc827a06f211d8b1d8cbcaff5927' 
  AND token = 'KNckI0kRV67BmtEPZUS6JKpqtNU7lXgOsyZTzy48L6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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