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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '512953ecc14b137df5d7dc8e2070787d4f32cfbc24dbc42e375e752fec03883f' 
  AND token = 'Bsesyd6uBk9wRnpFfMFwpXyWs349AVOlDOsUuKdZqj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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