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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eae37aeed207e130c290534b7d2e3226b5d173b8d6bd43485c9c101b9ce6749f' 
  AND token = 'Z7AmQ4H2eiSL7ZUynSkFSpXTnDHDJXIwQs5NTMZcJ88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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