SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8976af7f728819aaeed4009493b4587a0bb39337d149fb6fb6bc064c4469a0a1' 
  AND token = 'G2plZ2/SRmdnGNLJ8zwVE7l7mQLpQ8UYRJlji6vykvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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