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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b9e9b352b3d2a8b1c4771d65ceca0ec9f4a9a55675b066984b91cf10855b4b5' 
  AND token = 'm65Gh2jsZ210bqwyC7fmRlxv0k8np1hdz94QJb/XoRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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