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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a6bd89dcb20ea8ff8b50cadbdd4ee79541671bd7cdebf45d52a4f986c9b6053' 
  AND token = 'VUnec7plxEtVvnfxnJ5P3BiNWWUAoe+QDYpX7A0iGAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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