SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2aa3911c4d9973368b2130b84e728ecc5ee9fff9cf1ce36467013b8b25c5c9c' 
  AND token = 'OhRCDjkxv+QdT5APKRSWf/usoulCIdz+Wa8LyJC8yQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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