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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd04e89c60ea82f725e0aeeec65bab8b9fa7d9c2697969f5bee6927577aa332d6' 
  AND token = 'wotbGPmhLDWihpleBbr+46G43Vc6iuxwjqdNWi251PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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