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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd33ae4d8e78a9c91ce5e85d0b33dd3e0a5b243857475246ae3d7ecacf6265b80' 
  AND token = '9G7xOo7iBQtjaRKfiCdXZxIiSz+XRw2RC1wtf/CoHMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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