SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1548c10823b8b3daa37cc52769f7a5299079a2a767deafbfb4810176ef4d3fd9' 
  AND token = 'LZ+dtuZugJrWXjqtWIhbi5sXHCfV4bnZl6w9K8OwLv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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