SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68080dd8506bb4016bc6c5774cb328d3f60b3225ff5a0d017c4aea790e8fa4e8' 
  AND token = 'lDwqwJIN05s84GLuHCJCmTkoNvnFZ+yxbN+2v0ZKs2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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