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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '761c50d99d4a5b6dd30e2aaf10af802f11da9df7993bcebc8c4a24549b3e2884' 
  AND token = 'bAJWhBhtlD0VmeZfMlg1xLYfIgrcTc2pWshY7DNad7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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