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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11ec43755e3b384c9850bdedb95bd2071531b98e0c2491d8a22ccfd101c98fb8' 
  AND token = 'xzn8cmruIE6LespdqhSt3Z7v5+sK5zS0N0jzQ5DGQUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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