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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8720607532f90128aa2ee4b5f22a8a90b5a525a16e38403ead162b7b29e10de0' 
  AND token = 'oWxoGoMvpYo08YPMavwKNvZz/+85YYVMK2IEx6EQG30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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