SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf68ec6ad949604268af0bdf513b9464a75e1d8577753e1e987f37b7fa1884af' 
  AND token = 'XpHFEZH1MB6UlTqnmA9CRIIY/6kGOV4pC9B9kISQZvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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