SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62915e146c16fae308bdd1fe74b7d45d1619ef0403a39ad958168fdf92172473' 
  AND token = 'XDWS7+SBAbaW34ULtl6YGrbDPROllVZha8mtcWvxpLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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