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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dc0c78eef21be43177e53b181a02c6aaf784685dfaff3e176f5b3d2647ff8a4' 
  AND token = '/4UKu9eBrU5aK1Tvx/t1Gre3A3Os7K4+PmtzaIjZoB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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