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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2eb90f366cdab9e893136a3b481f6f563071313330dcd60b675d8fc46766d1b7' 
  AND token = 'QPknb6zXhZRwZutRLhdUcet2rLcPvphvK3b/DrC34DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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