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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29bf67f9a5f59fc49f4d227c0f9249ad6903eeb336c2fcb6b62f5244bc1de521' 
  AND token = 'tVediJyFy2qGNM+zmYXmcuGLStEO50sM6m/6Dmi/zNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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