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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca687c1ad8c7e116195b029f7bd946d0c573478189a4ca216341ed14e68f6277' 
  AND token = '2rY8rvdV5IDzksUjEh7N3a7TF4hRFRByfro2Uyb1hTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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