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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb56c3aebb21a9b4866b08a986f857f26327f560ba33fcfd34d283087c8aec23' 
  AND token = 'sGNfHEytoAl4l13Pdoosp79ZuQ+CjpIwiO7fXQT4u9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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