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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b985f189b0f539986f838cc26f967b24479e16cae0ece48ed962a3e98460781' 
  AND token = 'm/nbwQ2QYSTcQN/T1IXqiTGPqCNpwyJLZQleEMAiUG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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