SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9f74c5bca08634f9dddabcf534f686fb77bb6e1c92eea1301ffe0c135365624' 
  AND token = 'a+4fERRh8ILOtESUjAmAi+/IgzxLlb1G4C6vNheuZnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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