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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23045f7236fb20149cd1740acffc05c91b024bd3105ad8ff5270190d4cc262df' 
  AND token = 'bfNA0gVoWl94/OvtFEJQclc3dPqLMP8BtTnOXFNodHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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